class Employee:
    _ID = 0
    name = ""
    age = 0
    def __init__ (self,name,age):
        self.name = name
        self.age = age
        self.id = self._ID
        self.__class__._ID += 1
 
    def sayHello(self):
        print("hello {}".format(self.name))

class CEO(Employee):
    def __init__(self,name,age):
        Employee.__init__(self,name,age)
    def sayHello(self):
        print("hello {}".format(self.name))

s=CEO("Mr.shu",21)
s.sayHello()
    
